fix(docs): Algolia highlight error

[FrontEndDog]

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Description

Before repair

After repair

__v may have the same effect as key in vue

🤖 Generated by Copilot at 2322da5

Fix search results bug in vp-search.vue component. Pass __v property to parent node to trigger reactivity.

Related Issue

Fixes #___.

Explanation of Changes

🤖 Generated by Copilot at 2322da5

• Fix search results not updating on query change (link)

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[github-actions]

🧪 Playground Preview: https://element-plus.run/?pr=14831
Please comment the example via this playground if needed.

[FrontEndDog]

@btea @tolking this PR fixed the highlighting error during the search.